There is only one number that obeys the following rules
it uses each digit 1-9 once only
the first digit is divisible by one (really!!!)
the first two digits make a number divisible by 2
The first three digits make a number divisible by 3
and so on to all nine digits
CAN YOU FIND IT
P.S. This is called a delectable number (according to mr Francombe anyway)
1 is triangle and square, so is 36, then you have to wait till 1225 and 41616
A piece of paper can be folded in half about seven times as any more and the paper starts to tear. If we could fold it 50 times however the thickness would be the distance from the earth to the sun
If a number is divisible by three then the sum of its digits is also divisible by three
In the infinite string of digits that is PI, at position 763 there are six nines in a row.
(Lookup - Feynman Point)
A4 Paper is such that, if the diagonal of the square is measured it is the same length as the length of the paper
This means you can calculate the ratio of the length of the sides of A4 (and A5, A3 etc.)
the largest known prime number from 2001
is the largest known prime number at this time (discovered 2006)
They are discovering about 1 new prime number every year. Here is the biggest, i would put it here but its would not fit.
How many zeros has a Googolplex?
In a room full of 23 people, there is a 50% chance that two people have the same birthday
(Lookup - The Birthday Problem)
FOUR is the only number that describes the number of letters it has. (actually that one is a bit rubbish)
There is a number where all the letters are in alphabetical order too. I will leave that one for you to find.
Also see discussion board for a challenge.
Any map can be coloured in such a way that no two connecting regions have the same colour.
Whats amazing is it only needs 4 different colours.
(Lookup - Four colour problem)
Interesting (Probably) Mathematical Facts
Any quadrilateral will tessellate
There is only one number that obeys the following rules
it uses each digit 1-9 once only
the first digit is divisible by one (really!!!)
the first two digits make a number divisible by 2
The first three digits make a number divisible by 3
and so on to all nine digits
CAN YOU FIND IT
P.S. This is called a delectable number (according to mr Francombe anyway)
1 is triangle and square, so is 36, then you have to wait till 1225 and 41616
A piece of paper can be folded in half about seven times as any more and the paper starts to tear. If we could fold it 50 times however the thickness would be the distance from the earth to the sun
If a number is divisible by three then the sum of its digits is also divisible by three
In the infinite string of digits that is PI, at position 763 there are six nines in a row.
(Lookup - Feynman Point)
A4 Paper is such that, if the diagonal of the square is measured it is the same length as the length of the paper
This means you can calculate the ratio of the length of the sides of A4 (and A5, A3 etc.)
the largest known prime number from 2001
is the largest known prime number at this time (discovered 2006)
They are discovering about 1 new prime number every year.
Here is the biggest, i would put it here but its would not fit.
How many zeros has a Googolplex?
In a room full of 23 people, there is a 50% chance that two people have the same birthday
(Lookup - The Birthday Problem)
FOUR is the only number that describes the number of letters it has. (actually that one is a bit rubbish)
There is a number where all the letters are in alphabetical order too. I will leave that one for you to find.
Also see discussion board for a challenge.
Any map can be coloured in such a way that no two connecting regions have the same colour.
Whats amazing is it only needs 4 different colours.
(Lookup - Four colour problem)
so for example
(Lookup - Multiplicative Functions)
also, by removing every other term we can get.
(Lookup - Wallis formula)